Thread-cutting attachment.



C. W. CARMAN.

THREAD CUTTING ATTACHMENT.

APPLICATION FILED JULY 2.191s.

1,173,769. Patented Feb.29,1916.

2 SHEETS-SHEET lnvvnvnm Char/ed l. far/72a A TTORNEYS Tm: COLUMBIA PLANDGRAPH 110., WASnln-PUN. n. c,

C. W. CARMAN.

THREAD CUTTING ATTACHMENT.

APPLICATION FILED JULY 2:1915.

1, 173,769. I Patented Feb. 29, 1916.

2 SHEETSSHEET 2- %mykwfi A By W M ATTORNEYS THE COLUMBIA PLAIfIOORAPH cu.. WASHINGTON. D c.

WITNESSES UNTTED STATES PATENT @FFTQE.

CHARLES WINTI-IEOP CARI/IAN, OF I IElVIPSTEAD, NEW YORK.

THREAD-CUTTING ATTACHMENT.

To all whom it may concern Be it known that 1, CHAnLns WV. CARMAN, a citizen of the United States, and a resident of Hempstead, in the county of Nassau and State of New York, have invented a new and Improved Thread-Cutting Attach- I ment, of which the following is a full, clear, and exact description. I

Among the principal objects which the present invention has in view. are: to provide a thread-cutting attachment for a sewing machine, arranged adjacent the path of travel. of the material being sewed, so that the operator may cause the same to be severed by a slight turn of the thread connecting a series of articles; to provide means for mechanically severing a continuous thread uniting the articles manufactured in chain form; and to provide a simple, and efficient thread-cutting mechanism for employment in types of sewing machines known as factory machines.

Drawings.Figure 1 is a plan view of a sewing machine head, having applied thereto a thread-cutting attachment, constructed and arranged in accordance with the present invention; Fig. 2 is a perspective view of the same; Fig. 3 is a detail view on an enlarged scale, showing in vertical elevation, a thread-cutting attachment of the character mentioned, the cover of the knife guard being removed; Fig. 4 is a cross section of the rotary knife and mounting therefor, the

section being taken as on the lined- 1 in Fig. 1; Fig. 5 is a face view of the detachable cover for the knife guard; and Fig. 6 is a view, showing a series or chain of articles united by the thread with which they are sewed, constructed in the manner usual in the manufacture of such articles at the present time.

Descm'7)ti0n.1n Fig. 6 of the accompanying drawings,-a series of salt bags, is shown, the adjacent members being connected with a short length of thread, which short lengths of thread are portions of the thread employed in constructing the bags. The practice has been to run off a chain of articles, such as the bags 11, the connecting thread 12 being subsequently severed by hand. This method has necessitated the employment of extra help to perform this service. A further objection has arisen, in that the connection formed by the thread 12 has interfered with the packing of the bags, compolling an arrangementof the bags in piles,

Specification of Letters Patent.

' shaft 14, is governed by the whereby the individual bag is reversely disposed in relation to the adjacent bags. Further, the piling or formation of packages of the bags in the manner indicated, has necessitated a loss of time on the part of the chief operator, or has required the employment of special help for this service. These objections are overcome by the present invention, where' the chief operator is enabled to sever the connecting thread 12 and place the severed bags in suitable packages, arranged with reference to the opening thereon in the manner desired and this without loss of time or distraction of attention from the. main work in hand. To this end, a disk cutting blade 13 is rigidly mounted on a bolt shaft 14, bearings for which are provided in ashort standard. Rigidly mounted on the said shaft, is a beveled friction wheel 16, by which rotary motion is transmitted to the shaft 14. The standard 15 is rigidly mounted on the table 17 of a sewing machine of the Character illustrated in the accompanying drawings. Movement is imparted to the shaft 14 by a transmission shaft 18. The shaft 18 is mounted in bearings 19, set out from a plate 20. The plate 20 has a perforation 21 to receive a lag bolt 22, by which the said plate 20 is secured to the machine head. The shaft 18 is connected to drive the wheel 16 and. blade 13 connected therewith, by means of a friction disk 23. The face of the disk 23 is adapted to bear against the periphery of the wheel 16 to drive the same. The proportionate rate of speed imparted by the disk 23 to the wheel 16 and set of the standard 15, and 1 parts mounted thereon, with reference to the said disk. The speed of the shaft 18 is determined by the ratio of the driven pulley 24 and the driving wheel 25, with which the sewing machine head is equipped. The frictional engagement between the wheel 16 and the disk 23, is governed by the expansion spring 26, which normally rests upon the boss for one of the bearings 19 and thrusts against an adjustable collar 27, fixedly mounted on the shaft 18, by means of a set screw 28. The blade 13'is protected by a housing 29. The housing 29 is partly cut away to provide a free-way 30, by which the thread 12 may be inserted under the blade 13 and against the cutting edge thereof. to be severed thereby. The housing 29 is closed by a removable cover, 31, shown best in Fig. 5 of the Patented Feb. 29, 1916.

Application filed July 2, 1915. Serial No. 37,678.

, is provided with an attachment of the character described, the operation usually followed in sewing articles such as the bags 11 is as follows: The 1n1t1al bag or first bag 0 the series is sewed in the manner indicated,

the sewing being started at the end of the bag, which is subsequentlyto be the mouth of thebag. The sewing follows the-long edge of the bag or side seam thereof. Having arrived at the bottom; edge of the bag, the line of sewing passes across to close the said bottom edge andarrives at the end of the bottom edge adjacent the side of theebag whichis formed by the folded material. The sewing of the particular bag is then completed. -The operator before beginning to sew the second or following bag, draws the thread 12 from the supply, with which the sewing machine is furnished. The.

needle is then inserted in the second or following article adjacent the opening edge thereof to begin sewing the long edgeof the bag. This seam having been started, the operator is free to move the previous article and the thread 12 connecting the seam with the article now being sewed, toward the Copies of this patent may "be obtained'for five cents each, by addressing the Commissio blade 13, passing the connecting portion of the thread 12, into the free-way '30 and under the cutting edge of the blade 13. The blade 13 immediately severs the connecting thread, freeing the article from the bag being sewed, so that the operator may without .lost motion or distraction of attention, place the article thus freed on the package or pile of bags being sewed. This operation is continued for each successive article, thereby avoiding the formation of the chain above referred to, illustrated in Fig. 6 of the drawings. I 1

Claim: V An attachment for a sewingmachine comprising a cutting blade disposed adjacent be cut by said blade; and a removable cover for said housing arranged to expose said blade.

I n witness whereof I have signed my name to this specification in the presence of two subscribing witnesses. CHARLES ammo? GARMAN.

Witnesses :1 r

JAMEs MoGovERN, FRANK" BRAITNER.

ner of Patents,

Washington, D. C. 

